(Swift 2) Blowfish CFB Mode Encryption

Demonstrates how to encrypt using Blowfish CFB (Cipher Feedback) mode.

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let crypt = CkoCrypt2()

    // Use "blowfish2" to produce correct results that match published blowfish test vectors.
    crypt.CryptAlgorithm = "blowfish2"
    crypt.CipherMode = "cfb"
    crypt.KeyLength = 256

    // EncodingMode specifies the encoding of the output for
    // encryption, and the input for decryption.
    // It may be "hex", "url", "base64", "quoted-printable", or many other choices.
    crypt.EncodingMode = "hex"

    // The block size of the blowfish algoirthm is 8 bytes, therefore the IV is 8 bytes.
    var ivHex: String? = "0001020304050607"
    crypt.SetEncodedIV(ivHex, encoding: "hex")

    // The secret key must equal the size of the key.  For
    // 256-bit encryption, the binary secret key is 32 bytes.
    var keyHex: String? = "603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4"
    crypt.SetEncodedKey(keyHex, encoding: "hex")

    // Encrypt a string...
    var encStr: String? = crypt.EncryptStringENC("In all intellectual debates, both sides tend to be correct in what they affirm, and wrong in what they deny. -- John Stuart Mill")
    print("\(encStr!)")

    let decrypt = CkoCrypt2()

    decrypt.CryptAlgorithm = "blowfish2"
    decrypt.CipherMode = "cfb"
    decrypt.KeyLength = 256
    decrypt.EncodingMode = "hex"
    decrypt.SetEncodedIV(ivHex, encoding: "hex")
    decrypt.SetEncodedKey(keyHex, encoding: "hex")

    // Now decrypt:
    var decStr: String? = decrypt.DecryptStringENC(encStr)
    print("\(decStr!)")

}